Tuple<T1,T2,T3,T4,T5>.Item1 Properti

Definisi

Ruang nama:

System

Rakitan:

netstandard.dll, System.Runtime.dll

Sumber:

Tuple.cs

Mendapatkan nilai komponen pertama objek saat ini Tuple<T1,T2,T3,T4,T5> .

public:
 property T1 Item1 { T1 get(); };

public T1 Item1 { get; }

member this.Item1 : 'T1

Public ReadOnly Property Item1 As T1

Nilai Properti

T1

Nilai komponen pertama objek saat ini Tuple<T1,T2,T3,T4,T5> .

Contoh

Contoh berikut mendefinisikan array Tuple<T1,T2,T3,T4,T5> objek yang komponennya berisi nama negara bagian di Amerika Serikat, populasinya pada tahun 1990 dan 2000, perubahan populasinya dalam periode 10 tahun ini, dan persentase perubahan populasinya. Kemudian melakukan iterasi melalui array dan menampilkan nilai setiap komponen dalam tuple.

using System;

public class Example
{
   public static void Main()
   {
      // Define array of tuples reflecting population change by state, 1990-2000.
      Tuple<string, int, int, int, double>[] statesData = 
         { Tuple.Create("California", 29760021, 33871648, 4111627, 13.8), 
           Tuple.Create("Illinois", 11430602, 12419293, 988691, 8.6), 
           Tuple.Create("Washington", 4866692, 5894121, 1027429, 21.1) };

      // Display the items of each tuple
      Console.WriteLine("{0,-12}{1,18}{2,18}{3,15}{4,12}\n", "State", 
                        "Population 1990", "Population 2000", "Change", 
                        "% Change");
      foreach(Tuple<string, int, int, int, double> stateData in statesData)
         Console.WriteLine("{0,-12}{1,18:N0}{2,18:N0}{3,15:N0}{4,12:P1}", 
                           stateData.Item1, stateData.Item2, 
                           stateData.Item3, stateData.Item4, stateData.Item5/100);      
   }
}
// The example displays the following output:
//    State          Population 1990   Population 2000         Change    % Change
//    
//    California          29,760,021        33,871,648      4,111,627      13.8 %
//    Illinois            11,430,602        12,419,293        988,691       8.6 %
//    Washington           4,866,692         5,894,121      1,027,429      21.1 %

open System

// Define array of tuples reflecting population change by state, 1990-2000.
let statesData = 
    [| Tuple.Create("California", 29760021, 33871648, 4111627, 13.8)
       Tuple.Create("Illinois", 11430602, 12419293, 988691, 8.6)
       Tuple.Create("Washington", 4866692, 5894121, 1027429, 21.1) |]

// Display the items of each tuple
printfn "%-12s%18s%18s%15s%12s\n" "State" "Population 1990" "Population 2000" "Change" "% Change"
for stateData in statesData do
    printfn $"{stateData.Item1,-12}{stateData.Item2,18:N0}{stateData.Item3,18:N0}{stateData.Item4,15:N0}{stateData.Item5,12:P1}"
// The example displays the following output:
//    State          Population 1990   Population 2000         Change    % Change
//    
//    California          29,760,021        33,871,648      4,111,627      13.8 %
//    Illinois            11,430,602        12,419,293        988,691       8.6 %
//    Washington           4,866,692         5,894,121      1,027,429      21.1 %

Module Example
   Public Sub Main()
      ' Define array of tuples reflecting population change by state, 1990-2000.
      Dim statesData() = 
          { Tuple.Create("California", 29760021, 33871648, 4111627, 13.8), 
            Tuple.Create("Illinois", 11430602, 12419293, 988691, 8.6), 
            Tuple.Create("Washington", 4866692, 5894121, 1027429, 21.1) }
      ' Display the items of each tuple
      Console.WriteLine("{0,-12}{1,18}{2,18}{3,15}{4,12}", "State", "Population 1990", _
                        "Population 2000", "Change", "% Change")
      Console.WriteLine()
      For Each stateData As Tuple(Of String, Integer, Integer, Integer, Double) In statesData
         Console.WriteLine("{0,-12}{1,18:N0}{2,18:N0}{3,15:N0}{4,12:P1}", _
                           stateData.Item1, stateData.Item2, _
                           stateData.Item3, stateData.Item4, stateData.Item5/100)      
      Next                                                                    
   End Sub
End Module
' The example displays the following output:
'    State          Population 1990   Population 2000         Change    % Change
'    
'    California          29,760,021        33,871,648      4,111,627      13.8 %
'    Illinois            11,430,602        12,419,293        988,691       8.6 %
'    Washington           4,866,692         5,894,121      1,027,429      21.1 %

Keterangan

Anda dapat menentukan jenis Item1 komponen secara dinamis dengan salah satu dari dua cara:

• Dengan memanggil GetType metode pada nilai yang dikembalikan oleh Item1 properti .

• Dengan mengambil Type objek yang mewakili Tuple<T1,T2,T3,T4,T5> objek, dan mengambil elemen pertama dari array yang dikembalikan oleh metodenya Type.GetGenericArguments .